Messages in this thread | | | From | Linus Torvalds <> | Date | Wed, 8 Jun 2022 08:51:40 -0700 | Subject | Re: [PATCH v11 07/14] mm: multi-gen LRU: exploit locality in rmap |
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On Tue, Jun 7, 2022 at 5:43 PM Barry Song <21cnbao@gmail.com> wrote: > > Given we used to have a flush for clear pte young in LRU, right now we are > moving to nop in almost all cases for the flush unless the address becomes > young exactly after look_around and before ptep_clear_flush_young_notify. > It means we are actually dropping flush. So the question is, were we > overcautious? we actually don't need the flush at all even without mglru?
We stopped flushing the TLB on A bit clears on x86 back in 2014.
See commit b13b1d2d8692 ("x86/mm: In the PTE swapout page reclaim case clear the accessed bit instead of flushing the TLB").
Linus
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